46 CRETACEOUS PELECYPODA 



The beaks are obtuse, incurved, and close together. The tooth in the right valve is 



large, but the hinge does not differ in any other respect from that of typical Corbults. 



Locality. In a light greyish or yellowish sandstone about 6 miles south of 



Arrialoor. 



Formation. — Arrialoor group. 



NEiERA, Gray, 1834., (see p. 37). 

 1. Ne^ra muttja, Stoliczka, PI. Ill, Fig. 6 ; PI. XVI, Eig. G. 



N. valvula dextra globosa, longiori quam alta, antice rotundata, postice caudata, 

 pertenui, fere hyalina, concentrice striis inorementi miimtissimis tecta ac confer- 

 tim puncturata ; umbone 2^rominulo, antice versus inciirvo. 



Height of the right valve : its length ... ... ... 0'62 



Thickness „ „ : „ ... ... ••• 0-31 



The very thin, almost hyaline, finely striated and punctured shell appears to 

 be characteristic of this species ; the beak is prominent, and strongly incurved towards 

 the front ; its sides are convex ; the anterior termination is rounded, the posterior 

 narrowly produced, and obtusely truncated at the end. The cartilage process is 

 elongated, but narrow, and the tooth in front of it indicated by a slight thickening of 

 the margin, which projects a little beyond the margin of the hinge. 



Locality .—'^oviih. of Parchairy, in a bluish sandstone ; only the figured valve 

 has been found. 



Formation. — Trichinopoly group. 



2. NEJ5RA DETECTA, StoUczJca, PI. Ill, Eig. 7 ; PI. XVI, Eig. 15. 



iV. valvula sinistra sttb-inflata, convexiuscula, tenui, antice rotundata, postice 

 caudata, concentrice striata ; wnbone postice versus inciirvo, carina obttisiuscula ab eo 

 oblique decurrente usque ad terminationem posteriorem rectiuscide prolongata. 



Height of the left valve : its length ... ... ... 059 



Thickness „ „ : .. ■■• •■■ ■•• 0-25 



This species is much more depressed than the previous, and the beak is incurved 

 in the opposite (posterior) direction ; the concentric striaj are somewhat stronger 

 anteriorly than posteriorly ; the upper margin of the wing is slightly insinuated, 

 its termination being bent upwards. The European N. caudata of Nillson is closely 

 allied to the present form, but it has the posterior end still narrower and longer, 

 and the beaks incurved in a direction perpendicixlar to the longitudinal axis of the 



shell. 



Locality. — The single specimen was found in the yellow sandy limestone near 

 Odium in company with Ttirnus lapidosus, Turrilites Bergeri, Ammonites ros- 

 tratus, &c. 



Formation. — Ootatoor group. 



